Fuel System Part - What's It's Correct Name & Where To Buy It? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

LuvNLife · 10-17-2014, 09:35 PM

I'm revamping the fuel system under my '87 GMC shortbed fleetside. The current setup is jury rigged so badly, it seems easier to just replace it.

The truck was EFI, but that's gone now in favor of a carb. The truck has twin fuel tanks, but only the passenger side is running. The former owner converted one side of the the dash tank switch into a kill switch, and we can't quite trace it all out. So, here's where I'm thinking of going.

I'd like to add a pair of low pressure, 30 GPH external electric fuel pumps, wire them both hot, then wire the grounds to twin rocker switches I'll put under the dash. I'll also install a pair of fuel gauges to go with them. That part is pretty straight forward. But, I need some type of "Y" junction to run the two fuel lines into, with one outlet to the carb. I have zero idea what that "Y" is called or where to find one.

Any thoughts or leads would really be appreciated.

Jerry

Kenfuzed · 10-17-2014, 09:54 PM

Just thinking your plan through, but if you run 2 pumps into a wye (Y) wouldn't fuel flow back into the other non-running side/tank as well? It seems fuel will simply take the path of least resistance unless you have a way to close the path to the unused side by way of a check valve.

Rather than wiring the pumps hot maybe a dual relay would work better. I saw this at Jegs.
http://www.jegs.com/i/JEGS-Performan...oductId=758615

tucsonjwt · 10-18-2014, 07:41 AM

I would favor just installing the stock system - it does not seem very complicated to me, but I am no mechanic. I did see a work around for a failed OEM dual tank set up that used a manual valve mounted on the outboard side of the floor pan next to the driver's seat. Fuel hoses from the two tanks ran to the manual valve and then to the fuel supply line.

I think the hard part of an OEM set up is getting the proper length and bends in the hard fuel lines. Others can post the wiring diagrams, and I think I have pics of the actual wiring installation on an older dual tank set up, if you want to see them. Rewiring from scratch should not be difficult. So, if your hard fuel lines are intact, I would still go with the OEM set up.

10-17-2014, 09:35 PM	#1
LuvNLife Registered User Join Date: May 2010 Location: Crossville, TN Posts: 142	Fuel System Part - What's It's Correct Name & Where To Buy It? I'm revamping the fuel system under my '87 GMC shortbed fleetside. The current setup is jury rigged so badly, it seems easier to just replace it. The truck was EFI, but that's gone now in favor of a carb. The truck has twin fuel tanks, but only the passenger side is running. The former owner converted one side of the the dash tank switch into a kill switch, and we can't quite trace it all out. So, here's where I'm thinking of going. I'd like to add a pair of low pressure, 30 GPH external electric fuel pumps, wire them both hot, then wire the grounds to twin rocker switches I'll put under the dash. I'll also install a pair of fuel gauges to go with them. That part is pretty straight forward. But, I need some type of "Y" junction to run the two fuel lines into, with one outlet to the carb. I have zero idea what that "Y" is called or where to find one. Any thoughts or leads would really be appreciated. Jerry

10-17-2014, 09:54 PM	#2
Kenfuzed Registered User Join Date: Jun 2014 Location: Glendora CA -> Tampa FL Posts: 587	Re: Fuel System Part - What's It's Correct Name & Where To Buy It? Just thinking your plan through, but if you run 2 pumps into a wye (Y) wouldn't fuel flow back into the other non-running side/tank as well? It seems fuel will simply take the path of least resistance unless you have a way to close the path to the unused side by way of a check valve. Rather than wiring the pumps hot maybe a dual relay would work better. I saw this at Jegs. http://www.jegs.com/i/JEGS-Performan...oductId=758615 __________________ 1966 C10 Short Fleetside 1988 Sportster, 2008 Street Glide Ken's 1966 C10 build "Red Ale" Follow on Instgram: @cv_performance https://instagram.com/cv_performance Harley Performance Parts: CV Performance (Harley related) Enjoying the ride!

10-18-2014, 07:41 AM	#3
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,191	Re: Fuel System Part - What's It's Correct Name & Where To Buy It? I would favor just installing the stock system - it does not seem very complicated to me, but I am no mechanic. I did see a work around for a failed OEM dual tank set up that used a manual valve mounted on the outboard side of the floor pan next to the driver's seat. Fuel hoses from the two tanks ran to the manual valve and then to the fuel supply line. I think the hard part of an OEM set up is getting the proper length and bends in the hard fuel lines. Others can post the wiring diagrams, and I think I have pics of the actual wiring installation on an older dual tank set up, if you want to see them. Rewiring from scratch should not be difficult. So, if your hard fuel lines are intact, I would still go with the OEM set up.



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